<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>简单的路由</title>
    <link rel="stylesheet" type="text/css" href="css1.css" />
    <script>
        let a1 = () => console.log(1)
    </script>

    <body>
        <input type="button" value="点击" onclick="a1()">
    </body>
</html>